The international breakthrough in Fernando Birri's director career. In the outskirts of Santa Fé there is an area called Tire diè, inhabited by the poor. A railroad passing through Tire diè crosses a huge bridge. The trains must slow their speed to a walking pace, and the young living in the area take the opportunity to beg for money from passengers. For most of them it is a way to stay alive, for all of them it is a perilous game with their lives at stake. This first documentary describing the misery in Argentina is a pioneer in the Latin American political film.